Machine for grinding valves



Patented Dec. 13. i898.

|.. n. CASTLE.

. MACHINEHJR GRINDING VALVES;

(Application filed July 6, 189B.)

3 Sheets-Sheet I.

(No Model.)

. No. 6l6,053. Patented Dec. l3, I898.

L. D. CASTLE. MACHINE FDR GRINDING VALVES.

'.'App1ication filed July 6, 1898.)-

3 Sheets-Sheet 2.

,N0 Model.)

' L. D. CASTLE.

MACHINE FOR GRINDING VALVES.

Patented Dec. 13, I898 (Application filed July 6, 189B.)

3 $heets-$heef3 (No Model.)

.Nirnn STATES LEWIS n. CASTLE'OF GREENSBURG, PENNSYLVANIA, ASSIGNOR TO JOHN T. KELLY, on NEW YORK, N. Y., AND GEORGE M. JONES, or PITTSBURGH.

PENNSYLVANIA.

MACHINE'FOR GR IN DING VALVES.

SPECIFICATION forming part of Letters Patent No. 616,053, dated December 13, 189 8 Application filed July 6, 1898. Serial No. 685,254. (No model.)

To all whom it may concern: I

Be it known that I, LEWIS D. CASTLE, a resident of Greensburg, in the county of Westmoreland and State of Pennsylvania, have invented a new and useful Improvement in Machines for Grinding Valves; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to machines for grindto ing valves and seats.

In the accompanying drawings, Figure 1 is a side elevation of the machine. Fig. 2 is an end view. Fig. 3 is a cross-section on line I) 3, Fig. 1. Fig. 4 is a top plan View. Fig.

.5 is an enlarged side View of a portion of the machine, partlyin section. Fig. 6 is a detail view of the support for the valve-body. I Fig. '7 is a detail view of a portion of the mechanism for moving the support for the valve-body. Like letters of reference indicate like parts in each of the figures. v v

The letter A designates a suitable frame upon which the parts are mounted. A shaft a, journaled in bearings a',has mounted there- 2 5 on the main driving-pulley connected by the belt a to a suitable power-shaft. Secured to the shaft a is the gear-wheel b, which meshes with the gear-wheel b on the shaft b journaled in bearings b Secured to the outer 3o ends of the shafts a 11 are the cranks c c.

To the wrist-pins c of said cranks are attached the straps (Z (1. At the outer ends of the straps dd are the belt-connectors (Z which connect the belte to said straps. These 3 5 bel -connectors are of such construction that they can be adjusted so as to tighten or 'slacken the belt, as may be desired.

The belt e passes up over the end pulleys e 6 thence alternately'under and over the 40 remaining pulleys e e e c e of the series. The pulleys e c e e are secured to the shafts fff f respectively. These shafts f f &'c., are journaled in bearings g on the frame.

The cranks c c are so mounted with relation to each other that when said cranks are in the positions shown in Fig. 2 lines drawn through the centers of the cranks and their wrist-pins will be in line with the belt. as' it passes over" the end puleys a e the wristpin of the crank 0 being below the center of the crank and the wrist-pin 0f the other crank being above the center; By this arrangement the cranks can pass each other without interfering.

On the inner ends of the shafts f f f &c., are the clutches g. These clutches g are adapted to engage the sliding clutches h,- keyed to the shafts f f f f by the feathers h. Hangers t on the slide-rods dengage the annular grooves in the clutches 71.. Thc'rods i are mounted in guides t and have the handles 2' by means of which they are moved back and forth to throw the clutches into and out of engagement with each other.

Secured to the ends of the shafts ff, 650., y

are the chucks 70, having the centering-pilla adapted to engage one end of the valveplug in the manner fully hereinafter set forth. In line with centerin -pins 7c of the chucks 7c are the centering-rods Z, having the pointed ends Z, adapted to engage the opposite end of the valve-plug. The rodsZa-re in serted in the split sleeves m at the upper ends of the standard mand are clamped therein by the bolts m adapted to be turned by the handle m The standards we have the bearingsnto receive the short shafts 01, upon which are secured the pinions n These pinions a mesh with the movable rack-bars 0 in the guides 0 of the standards.

Secured to the rack-bars 0 are the carriages 1, adapted to carry the valve-bodies, as will more fully hereinafter appear. These carriages r ride on the dovetailed guideway r. Secured to the carriages r are the plates 8 and to said plates the adjustable plates s. These adjustable plates 8 are connected to the plate 8 by means of bolts passing through slots in said plate 3, whereby the position of said plates 8 with relation to each other may be varied. 0n the plates 8' are posts .9, which form a seat for the reception of the Valve-body. A linert is placed in this seat to support'the valve-body at certain times.

An arm u is secured to the shaft 97., and said arm may carry a weight at its outer end, if necessary. A rod v abut-s against the arm u, said rod passing through the guide to on thebracket w. At,the lower end of the rod 1) is the roller n, which moves in contact with the knocker-disk having the knockers as thereon.

On the same shaft g which carries the knockers is the bevel gear wheel 7 which meshes with the bevcl-pinion 'y on the shaft 12 I do not wish to be understood as limiting.

myself. in any sense to the particular mechanism-shown and described, as it may be modified and varied without affecting the body with the connection 2' for connecting it up to the pipe and having the customary taporing seat a extending through it at right angles to said connections. Within the tapering seat is the tapering plug 2 with the handle .2 The unfinished valve-body and plug are adjusted into position to be operated upon by dropping thli valve-body down into the seat formed by the posts 8 whereupon the ends of the plug a will project beyond said posts in line with the centering-points of the chuck 7c and therod Z.- The rod Z is then forced into contact with the end of the plug adjacent thereto, forcing the'other end of said plug onto the chuck it. The plug is thus clamped in position, and the valve is ready for the grinding operation. ator applies to the plug before insertion a suitable mixture of grease and abrading material. The clutch h is then thrown into engagement with the clutch g, which imparts a rotary movement to the chuck it, and consequently to the plug 2 centered thereon. This rotary movement, however, is oscillatory, owing to the action of the belt e. From the description hereinbefore set forth it is apparent, as clearly set forth in Fig. 2 that the gear-wheels b b travel in opposite directions, as indicated by the arrows. With the cranks in the position shown in said Fig. 2 as said gear-wheels continue.- to revolve the crank 0 will begin to ascend in the'direction of rotation of its gear-wheels 1), while the crank 0 will begin to descend in an opposite direction. As this movementcontinues the belt e will rotate the pulleys e e e c all in the same direction. continue to rotate in this direction until the crank 0 reaches its highest. point and the crank 0 reaches its lowest point, whereupon as said crank c begins-to descend and crank c to ascend the pulleys e e e e will be rotated in the opposite direction. Just when the crank-c arrives at its highest point and crank c at its lowest point a slight slack takes place in the belt e and it slips slightly, so that even after the cranks have passed a short distance beyond their highest and lowest points the momentum imparted to the pulleys a e e e by the travel of the cranks to these points will cause said pulleys to continue to The oper The said pulleys will rotate in the same direction; but as said belt begins to tighten again when the cranks pass from their highest and lowest points the momentum of said pulleys is checked and their direction of rotation is reversed. In like man ner when the cranks arrive at the positions shown in Fig. 2 the belt slackens slightly, as before, as the pulleys continue in the same direction until the cranks pass a short distance, the crank c in its upward movement and crank c" in its downward movement, whereupon the slack is taken up and the pulleys are reversed. This same oscillatory movement is of course imparted to the plugs a working in the seats in the valve-bodies z. This movement of the plug first in one direction and then in the other,with the assistance of the abrading mix ture, grinds thevplug in its seat and removes the rough surfaces of the plug and its seat, leaving them smooth and polished, so that when the plug is seated a tight close union is effected. Furthermore, by the slight continued movement of the plug in the same direction, even after the reversing mechanism has in fact reversed the direction of rotation, r

the amount of movement of the plugis not constant. It may stop at a diiferent point each time it is reversed, so that no more grinding is done atone point than'at another. While the plug a is being oscillated in the manner described, the valve-body z is being moved back and forth on the carriage 'v by the action of the knockers as on the rod c.

As the arm a is raised by the knockers it'acts through the pinion n to draw back the rackbar 0; but when the knockers pass from un der the rod U the dropping of the arm n ad vances said rack-bar. In this manner the valve-body keeps moving back and forth on the plug. By throwing up the arm to the operator can draw the carriage supporting the valve-body away from the pin g, which leaves the plug exposed for the purpose of applyin g more of the abrading mixture. 1

While I have described my invention with reference to the grinding of one valve and seat, it isof course apparent that the machine is capable of grinding four at one time and that this number may be increased or diminished according to circumstances.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In apparatus, for grinding valves, the combination with a suitable frame, of an 0s cillatory shaft, a support for the valve on said shaft, a belt, and oppositely-driven cranks connected to said shaft by said belt, substantially as set forth.

2. In apparatus for grinding valves, the combination with a suitable frame, of an oscillatory shaft, a support for the valve on said. shaft, mechanism for oscillating said shaft, a carriage adapted to support the valve-body, a rack-bar on said carriage, and mechanism for moving said rack-bar to and fro, substantially as set forth.

Iio

3. In apparatus for grinding valves, the

ombination with a suitable frame, of an osa carriage adapted to support the valve-body, cillatory shaft, asnpport for the valve on said a rack-bar on said carriage, a pinion engagshaft, mechanism for oscillating said shaft, ing said rack-bar, an arm connected to said I 5 a carriage adapted to support the valve-body, pinion, a slidable rod abutting against said 5 a rack-bar on said carriage, a pinion engagarm, and a knocker moving in the path of ing said rack-bar, an arm connected to said saidrod, substantially as setforth.

pinion, and. mechanism-for raisingan'd View: In testimony whereof I, the said LEWIS D.

ering said arm, substantially as set forth. CASTLE, have hereunto set my hand.

4. In apparatus for grinding valves, the LEWIS DVGASTLE. 1o combination with a suitable frame, of an os- Witnesses:

cillatory shaft, a support for the valve on said ROBT. D. TOTTEN,

shaft, mechanism for oscillating said shaft, ROBERT C. TOTTEN. 

